Machine for shaping and grinding stones for blast furnaces



Nov. 13, 1928. 1,691,898 w. KOSFELD MACHINE FOR SHAPING AND GRINDING STONES FOR BLAST FURNACES Filed Jan. 20, 1927 2 Sheets-Sheet 1 //7 venzor:

W/L HELM KosFELD BY 4 ATTO/QNE Y Nov. 13, 1928. I 1,691,898

W. KOSFELD MACHINE FOR SHAPING AND GRINDING STONES FOR BLAST FURNACES Filed Jan. 20, 1927 2 Sheets-Sheet 2 lnvenfor'; W/LHEL KOsF-LD e Patented Nov. 13, 1928.

UNITED STATES.

1,691,898 PATENT OFFlCE.

KOSFELD, OF DORTMUND, GERMANY.

MACHINE FOR SHAPING AN GRINDING STONES FOR BLAST FURNACES.

Application filed January 20, 1927, Serial No. 162,402, and in Germany November 16, 1925.

Grinding machines for grinding and polishing stones are universally known. In most cases stones are only levelled or polished by these machines. For imparting an a- 6 curate profile such as is necessary for linmg new blast furnaces with masonry these machines cannot be used.

With the continually increasing blast pressure in the newer blast furnaces it is of great importance to have superposed surfaces of the stones used to line the furnace so that the joints may be as small as possible, whereby greater tightness of the masonry lining 1s secured. In this ,way continual losses are 1 avoided.

The machine shown in the accompanying drawing and hereinafter described fulfills this purpose. The fireproof'carbon stones are accurately ground to templates. The

stones are made up to a size of about 1000 x 500 x300 m/m and of rectangular shape. They must be accurately fitted into place where they are going to be used. Hitherto the stones have been worked'by hand. This method of treatment is however very egrpensive and takes up a great deal of time.

At the very most a man can only turn out two stones in eight hours. Hitherto there has been no suitable machine for this purpose.

The new machine will turn out about 16 to 20 stones completely finished in eight hours. The workmanship is considerably more accurate and more uniform than can be accomplished-by hand.

In the accompanying drawings: Fig. 1 is a side elevation of the machine with the grinding roller '5 andfork g lILhOIl- 'zontal position. Fig. 2 is a front elevation of the machlne shown in Fig. 1, but with the roller 11 and fork g tilted at an angle with the horizontal.

Fi 3 is a plan view of a portion of the grin ing roller and its forked mounting.

Fig. 4 is a longitudinal central sectlonthrough the grinding roller.

Fig. 5 is asimilar section of a profile grinding roller. v

Fi 6 is'a' plan view of'a grinding mach ne shownig the pivotal relation of eye bearmg c with respect to the grinding roller, and to the motor and its platform.

Figs. 7 and 8 are diagrammatical front views of the grinding roller showing how its.

angle of obliquity may be varied by changing the templates. v

Themachine consists of the lower part a in -m and m file of the templates to the roller 11.

which the guide rollers andsupporting rollers b for the table or bed are mounted. The table or bed 0 serves to receive the stones to be operated on. On the lower part a are also mounted the two side standards d, 01 These two standards 03 d carry the vertically adjustable bearings e and e wlnch carry. the revolving shaft f. In the middle of this shaft is arranged an eye bear- 1ng e 1n which the pivot pin 2 of the fork g of the grinding roller is mounted. The pivot pin a may also be journaled in a bearlng w (F1 6) but this is not essential. On this fork of t e grinding roller is also mounted the at tachment surface for the driving motor it so that this latter is compelled to follow the movement of the grinding roller. This enables thebelts to be transferred simply The grlnding roller 71 is mounted in the forked bearings of the fork g of the grinding roller. Independently of the grinding roller the two guide rollers J0 and 70 are rotatably mounted on the grinding roller spindle. On the table or bed are also mounted the two template holders Z and Z for fixing the templates On these templates roll the twoguide rollers k and k and transmit the pro-,

The feed ad] usts the grindin roller to correspond to the profile of the temp ates. Theadvance of the table or bed is produced by the hand wheel 11,. The feed may however also be effected automatically. By means of the hand wheel the pinions 0 and- 0 which gear into the racks p and p are rotated. ,The raising and lowering of the fork of the grinding roller is effected by the aid of two screw-threaded spindles g and g which lie in the side standards. These icrew-threaded spindles g and g? are driven y the table or bed is a recessvinto which is let a box 8 in which the stone to be operated on is placed when the end faces are to be ground. Thisarrangement is provided so that the dimensions of the machine may be kept as small as possible.

bevel wheels from the hand crank r. In

The method of carrying 81a the work is' as fixed in the template holders Z and 1 The table or bed is then run towards the (grinding roller until the guide rollers 7:. an In bear its against the sets of templates. Thevmotor is then started after which the table or bed is moved forwards by means of the hand wheel or by some interposed automatic gearing. The dust which is produced is removed by a special dust extracting device which is not shown.

As is shown in Figure 4, the roller for ordinary grinding is made hollow so as to save weight and power. The cast iron body is covered with a coating of grinding material.

In Figure 5 is shown a profile roller. This roller is composed of any kind of grinding discs that may be desired such as used for milling. In order that the composite roller may not be of too great a weight the separate discs are made of wood covered on their peripheries with a suitable grinding material. By means of such a roller all kinds of profiles or contours for mouldings can be produced in a short time.

The grinding rollers shown in Figs. 14 have a different diameter from those shown in Figs. 6-8, but it will be understood that the grinding rollers may be of any preferred size. 7

Figs. 7 and 8 show different sized templates in use, the grindingrollers consequently assuming different oblique positions.

Having now particularly described and ascertained the nature of my said invention, what I claim and desire to secure by Letters Patent of the United States is:

1. A machine fOr automatically shaping stones and the like comprising a bed for the article to be shaped, a grinding roller above the bed, said bed and said roller being re1atively movable in the direction of the longitudinal axis of the machine, means for supporting the grinding roller, said means including means permitting rising and falling movement of the roller and means permitting tilting of the roller, templates mounted upon the bed, means movable with the roller in its up and down and tilting movements and cooperating with the templates to cause-any predetermined rising and falling and tilting movement thereof, and means for rotating ,the grinding roller.

2. A machine for automatically shaping and grinding stones comprising a bedfor the stone to be shaped and ground, a grinding roller above the bed, means for moving the bed longitudinally of the machine so that the 1 grinding roller may act on the stone supported on the bed, a shaft for the grinding roller, a fork in the ams of which are ournaled the ends of the roller shaft, a pivot pin extending ,parallel to the longitudinal axis of the machine and rigid with the yoke of the fork, an eye bearing-in which the pivot pin is journalled, a shaft journaled between its ends in the eye bearing and transversely of the machine, guide rollers provided on the first mentioned shaft, templates mounted on the machine for guiding the guide rollers so that the grinding roller may be tilted horizontally and moved vertically in accordance with the shape of the templates to shape and grind the stone accurately to a predetermined shape and size, and a motor rigidly mounted on the fork to swing therewith.

WILHELM KOSFELD. 

